Tunable multispectral narrowband absorber and directional absorption enabled by layered quasi-periodic structure and phase-change materials

Abstract

Based on the Optical Tamm States (OTS) effect of phase-change material (PCM) Ge-Sb-Te (GST), a tunable multispectral selective narrowband absorber is proposed. The application wavelength range is combined with the solar spectral distribution in this study. Compared with other absorbers with complex shapes, this planar device is easier to manufacture, making it possible for the photolithographic, large-scale, cost-effective manufacturing process. Through the phase change of GST, the multi-spectral narrowband absorption of the harmful gas SO2 (1.35 μm), NO2 (1.59 μm), NO (1.91 μm) and CO (2.1 μm) of the vehicle exhaust was finally realized. Meanwhile, it shows good directivity and polarization performance in the wavelength range of 1.7–2.0 μm, and finally high S-polarization absorptivity (>90 %) at 75–80° incident angle was achieved. The present work is of potential application value in the research areas of infrared detection, energy management, information encryption and so on.